Air angiogram.
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ABSTRACT:
SUBMITTER: Malviya A
PROVIDER: S-EPMC4832756 | biostudies-literature | 2014
REPOSITORIES: biostudies-literature
Publications
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| S-EPMC7655303 | biostudies-literature
Project description:We release a new dataset containing invasive coronary angiograms for the coronary dominance classification task, an essential aspect of SYNTAX score estimation for assessing the severity of coronary artery disease. The dataset contains 1,574 angiographic studies, a set of X-ray multi-view videos classified as right or left dominant. The dataset has three parts: main, real distribution, and domain shift. Each study in the main dataset falls into five categories: normal, poor quality, artifact, high uncertainty, or right coronary artery (RCA) occlusion. These tags help classify the dominance more accurately and allow for uncertainty estimation and outlier detection. In the real distribution part, there are 400 randomly selected studies. In contrast the domain shift part includes studies from an interventional angiography system that differs from that used in the main and real distribution parts.
| S-EPMC11865480 | biostudies-literature
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| S-EPMC10263450 | biostudies-literature
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| S-EPMC1861272 | biostudies-literature
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| S-EPMC10672579 | biostudies-literature
Project description:PurposeTo investigate macular perfusion in healthy Chinese individuals and examine its dependence on age and sex.MethodsHealthy adult Chinese individuals were recruited. Macular perfusion was measured by spectral-domain optical coherence tomography (OCT) using the split-spectrum amplitude-decorrelation angiography (SSADA) algorithm. The parafoveal flow index and vessel area density as well as the area of the foveal capillary-free zone (CFZ) were quantified.ResultsA total of 76 eyes in 45 subjects were included (20 males and 25 females, mean age 36 ± 11 years). The mean parafoveal flow index was 0.099 ± 0.013; the mean vessel area density was 0.891 ± 0.073; and the mean CFZ area was 0.474 ± 0.172 mm2. All three parameters were significantly correlated with age (flow index: P = 0.00; vessel area density: P = 0.00; CFZ area: P = 0.02). The flow index and vessel area density decreased annually by 0.6% and 0.4%, respectively, and CFZ area increased by 1.48% annually. The CFZ area was larger in females than in males, while all three parameters seemed to change more rapidly with age in males than in females.ConclusionsIn healthy Chinese eyes, macular perfusion decreased with increasing age, and decreased more rapidly in males than in females. The application of OCT angiograms may provide a useful approach for monitoring macular perfusion, although caution must be exercised with regard to age- and sex-related variations.
| S-EPMC4455309 | biostudies-literature
Project description:BackgroundSpontaneous angiogram-negative subarachnoid hemorrhage (SAH) is considered a benign illness with little of the aneurysmal SAH-related complications. We describe the clinical course, SAH-related complications, and outcome of patients with angiogram-negative SAH.MethodsWe retrospectively reviewed all adult patients admitted to a neurosurgical intensive care unit during 2004-2018 due to spontaneous angiogram-negative SAH. Our primary outcome was a dichotomized Glasgow Outcome Scale (GOS) at 3 months. We assessed factors that associated with outcome using multivariable logistic regression analysis.ResultsOf the 108 patients included, 84% had a favorable outcome (GOS 4-5), and mortality was 5% within 1 year. The median age was 58 years, 51% were female, and 93% had a low-grade SAH (World Federation of Neurosurgical Societies grading I-III). The median number of angiograms performed per patient was two. Thirty percent of patients showed radiological signs of acute hydrocephalus, 28% were acutely treated with an external ventricular drain, 13% received active vasospasm treatment and 17% received a permanent shunt. In the multivariable logistic regression model, only acute hydrocephalus associated with unfavorable outcome (odds ratio = 4.05, 95% confidence interval = 1.05-15.73). Two patients had a new bleeding episode.ConclusionSAH-related complications such as hydrocephalus and vasospasm are common after angiogram-negative SAH. Still, most patients had a favorable outcome. Only acute hydrocephalus was associated with unfavorable outcome. The high rate of SAH-related complications highlights the need for neurosurgical care in these patients.
| S-EPMC8761132 | biostudies-literature
Project description:ObjectivesThis study sought to assess the ability of a novel virtual coronary intervention (VCI) tool based on invasive angiography to predict the patient's physiological response to stenting.BackgroundFractional flow reserve (FFR)-guided percutaneous coronary intervention (PCI) is associated with improved clinical and economic outcomes compared with angiographic guidance alone. Virtual (v)FFR can be calculated based upon a 3-dimensional (3D) reconstruction of the coronary anatomy from the angiogram, using computational fluid dynamics (CFD) modeling. This technology can be used to perform virtual stenting, with a predicted post-PCI FFR, and the prospect of optimized treatment planning.MethodsPatients undergoing elective PCI had pressure-wire-based FFR measurements pre- and post-PCI. A 3D reconstruction of the diseased artery was generated from the angiogram and imported into the VIRTUheart workflow, without the need for any invasive physiological measurements. VCI was performed using a radius correction tool replicating the dimensions of the stent deployed during PCI. Virtual FFR (vFFR) was calculated pre- and post-VCI, using CFD analysis. vFFR pre- and post-VCI were compared with measured (m)FFR pre- and post-PCI, respectively.ResultsFifty-four patients and 59 vessels underwent PCI. The mFFR and vFFR pre-PCI were 0.66 ± 0.14 and 0.68 ± 0.13, respectively. Pre-PCI vFFR deviated from mFFR by ±0.05 (mean Δ = -0.02; SD = 0.07). The mean mFFR and vFFR post-PCI/VCI were 0.90 ± 0.05 and 0.92 ± 0.05, respectively. Post-VCI vFFR deviated from post-PCI mFFR by ±0.02 (mean Δ = -0.01; SD = 0.03). Mean CFD processing time was 95 s per case.ConclusionsThe authors have developed a novel VCI tool, based upon the angiogram, that predicts the physiological response to stenting with a high degree of accuracy.
| S-EPMC6503181 | biostudies-literature
Project description:IntroductionFluorescein angiography (FA) is a useful investigation in the diagnosis and treatment of retinal and choroidal disease. FA has well-reported adverse effects, most being mild. Very few cases have reported cutaneous venous staining following FA.Case presentationTwo cases are reported. Case 1 was a 90-year-old female with bilateral neovascular age-related macular degeneration. In the few minutes following her routine FA, she developed cutaneous fluorescein staining ascending along the superficial forearm veins proximal to the cannula in situ at the dorsal wrist. Case 2 was a 50-year-old male with diabetic macular oedema. In the minutes following his FA, he developed cutaneous fluorescein staining descending along the dorsal forearm veins distal to the cannula in situ at the cubital fossa. Both patients were managed conservatively with the stain resolving in the next few days.ConclusionCutaneous fluorescein staining around superficial vasculature is a rare phenomenon. Despite this, it seems to be self-limiting and does not require any treatment.
| S-EPMC11250062 | biostudies-literature
Project description:PurposeTo develop a method to use information from multiple MRI contrasts to produce a composite angiogram with reduced sequence-specific artifacts and improved vessel depiction.MethodsBayesian posterior vessel probability was determined as a function of black blood (BB), contrast enhanced angiography (CE-MRA), and phase-contrast MRA (PC-MRA) intensities from training subjects (N = 4). To generate composite angiogram in evaluation subjects (N = 12), the voxel-wise vessel probabilities were weighted with a confidence measure and combined as a weighted product to yield angiogram intensity. For 23 internal carotid artery (ICA) segments (N = 23) from evaluation subjects, segmentation accuracy of composite MRA was evaluated and compared against CE-MRA using dice similarity coefficient (DSC).ResultsThe composite MRA suppressed venous contaminations in CE-MRA, reduced flow artifacts, and velocity aliasing seen in PC-MRA and removed signal ambiguities in BB images. For ICA segmentations, the composite MRA improved segmentation over CE-MRA per DSC (0.908 ± 0.037 vs. 0.765 ± 0.079). Compared with CE-MRA, the composite MRA showed conservative changes in vessel appearance to small threshold changes. However, small vessels that are sensitive to registration errors or visible only weakly in CE-MRA were susceptible to poor depiction in composite MRA.ConclusionBy dynamically weighting vessel information from multiple contrasts and extracting their complementary information, the composite MRA produces reduced sequence-specific artifacts and improved vessel contrast. It is a promising technique for semi-automatic segmentation of vessels that are hard to segment because of artifacts.
| S-EPMC6879793 | biostudies-literature